An operating assembly for use with a door is disclosed. The operating assembly has a motor housed in an enclosure that is positioned in a floor cavity. The motor rotates a drive spindle. An actuator assembly is attached to the floor. An actuator track is attached to the enclosure and has a slot configured to receive at least a portion of the drive spindle. A first converter is positioned at one end of the actuator track and is coupled to the drive spindle. A second converter is positioned at the other end of the actuator track. A drive element attached to a bottom surface of the door is positioned in the track. A transfer device couples the first and second converters to the drive element. During operation, the motor rotates the drive spindle and the first converter to move the transfer device to move the drive element and the door.